Annexin VII: an astroglial protein exhibiting a Ca2+-dependent subcellular distribution.

Abstract

A fundamental issue in neuronal and glial cells is how intracellular rises in Ca2+ are coupled to signaling cascades and changes in subcellular morphology. We studied the expression and localization of annexin VII (synexin), a Ca(2+)-/GTP-dependent membrane fusion protein, in the human CNS. Here, we demonstrate the presence of two annexin VII isoforms (47 and 51 kDa) in human brain tissue as well as its exclusive expression in astroglial cells. An in vitro study of astrocyte-derived C6 rat glioblastoma cells expressing a GFP tagged annexin VII fusion protein demonstrates a sequential redistribution of the fusion protein in response to rising intracellular Ca2+ concentrations. Our findings indicate a role of annexin VII in the regulation of intracellular Ca(2+)-dependent processes in astroglial cells.

• Authors: C S Clemen, C Herr, A A Lie, A A Noegel, R Schröder
• Journal: Neuroreport (Neuroreport) Vol. 12 Issue 6 Pg. 1139-44 (May 08 2001) ISSN: 0959-4965 [Print] England
• PMID: 11338180 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Annexin A7
• Protein Isoforms
• Calcium

Topics

• Animals
• Annexin A7 (biosynthesis, metabolism)
• Astrocytes (metabolism)
• Brain (metabolism)
• Calcium (metabolism, physiology)
• Humans
• Intracellular Fluid (metabolism)
• Protein Isoforms (biosynthesis, metabolism)
• Rats
• Subcellular Fractions (metabolism)
• Transfection
• Tumor Cells, Cultured